Samuel w



(ModeL) S. W. MARTIN.

PUMP.

Patented Feb. 28

TITED STATES PUMP.

SPECIFICATION forming part of Letters Patent No. 254,227, dated February 28, 1882.

- Application fi1edNovember18,1881. Model) To all whom it may concern Beit known that I, SAMUEL W. MARTIN, of Springfield, in the county of Clark and State of Ohio, have invented certain Improvements 5 in Pumps, of which the following is a specification.

This invention relates to an improved manner of constructing and applying valve-seats to pumps.

It relates more particularly to that class of pumps in which the vertical-pump cylinder is screwed or otherwise secured at its lower end into a cap or base-piece, with the edges of the leather valve-disk or other valve-holding device secured between the cylinder and the cap.

The object of the invention is to apply abrass or other non-corrodible valve-seat in a cheap and convenient manner, so that it may be adjusted accurately and tightly, and that it may be readily replaced when required.

Tothis end it consists in constructing the seat of sheet-brass or other thin material and clamping the edges of the same between the cylinder and cap; also, in constructing acap in the peculiar manner hereinafter described,

to support the seat, and in combining a packing therewith.

Referring to the drawings, Figure l is a vertical central cross-section through the lower 0 end of a pump-cylinder and cap with the valve and valve-seat in position therein. Fig. 2 is a top plan view of the valve-seat. Fig. 3 is a top plan view of the valve.

A represents a cylinder of a pump, its lower 5 end threaded externally and screwed within a cap or collar, B, as usual, the cap being adapted, as usual, for connection with the suction or lift/pipe through which water is deliveredinto the base of the cylinder. As shown 0 in the drawings, the cap is provided around its throat or opening with a narrow raised edge or rim, or, and also provided in its interior with 'an outer flat face, I), to sustain the packing.

0 represents the packingring, consisting in the present instance of a flat annular washer, of rubber or other suitable material, seated within the cap B upon its face b.

D represents my valve-seat, consisting of an annular plate of thin brass-or equivalent ma- 5o terial, made of either sheet or cast metal. It is preferred, however, on account of the greater cheapness and accuracy and of the elasticity secured, to form the seat by stamping up sheet metal in a die.

It will be seen that the valve-seat has its 5 5 outer edge made of suitable form to rest upon the packing-ring G, and that its inner edge is curved and adapted to fit over and upon the raised edge a of the cap.

It is preferred to depress that portion of the sheet lying between its inner and outer edges, as shown in the drawing; but this is not absolutely necessary.

E represents the valve, constructed, as usual, of a disk of rubber, having a slot formed therein, so as to leave a central portion at one side only, in order that it may rise and fall freely, the central portion being provided, as usual, with a weight, (I, by which to insure its descent.

The packing is inserted, as shown, with its inner edge resting upon the upper edge of the valve-seat D and its outer edge resting upon .the packing-ring O', beneath the lower end of the cylinder A, which is screwed or otherwise held down firmly thereon. It will be seen that under this arrangement the valve, the seat, and the packing are all clamped and heldsecurely at their outer edges between the cylinder and its cap, and that the valve-seat is clamped firmly between the elastic surfaces of the packing and the valve, while at the same time its inner edge is held down firmly upon and supported by the flange a.

' Under this construction and arrangement of 8 parts leakagepast or around the seat is prevented, the seat held firmly and accurately in position, and the valve consequently caused to close tightly when in action.

I am aware that iron pumps have been proo vided with brass valve-seats in various forms.

I am also aware a sheet-metal valve-seat differing both in construction and arrangement from that herein described and shown has been suggested. 5

I am aware thata pump has been constructed wherein the suction-pipe was provided with a heavy flan ged mouth formed integral therewith, seated between the lower end of the cylinder and the base-piece thereon, serving as a valveseat, and this I do not claim. In my construction the valve-seat is a plate, independent of the suction-pipe, made of thin metal and introduced beneath the cylinder.

Having thus described my invention, what I claim is r 1. In combination with the cylinder and the cap, the non-corrodible valve-scat, having its outer edge secured between the cylinder and cap and its inner edge supported by a narrow raised lip or rim on the cap, as described and shown.

2. In combination with the pump-cylinder and cap, the thin metal valve-seat, having its outer edge confined between the cylinder and cap, its inner edge supported upon a raised annular lip, and its middle portion depressed, substantially as described and shown.

3. The cylinder and its cap or base, in combination with the valve, the thin metal valveseat, and the packing, all three inserted and secured between the cylinder and cap, substantially as described and shown.

SAMUEL .w. MARTIN.

Witnesses:

O. O. KIRKPATRICK, G. E. HIGHLEY. 

